祁连山青海云杉林抚育更新研究

Investigation on Reproduction by Tending Treatments for Picea crassifolia forest in Qilian Mountains

为培育祁连山水源涵养林资源，对该林区青海云杉林抚育更新进行了调查，结果表明：影响青海云杉林天然更新的主导因素是水热条件及其时空组合和配比、林分郁闭度、林内地被物厚度和盖度以及放牧。更新迹地的管护是人工造林更新的关键环节，封山育林是促进天然更新和造林更新的重要手段和措施。森林抚育有利于培育后备资源，在抚育强度为８．５％～３０％，抚育后林分郁闭度为０．５～０．６时能有效地促进天然更新。

To breed up forest resources in Qilian mountain forest zone,the tending regeneration is Investigated on Picea crassifolia forest in the zone.The results show that the main elements affecting natural regenration are water-heat composition,the stand crown closure,coverage and thickness of vegetation in the forest and pasture.The management of the regeneration under selection cutting is the key measure for artificial regeneration.And closing the hill to facilitate afforestation is the important method and measure for stimulating natural reafforestation and artificial regeneration.The forest tending is favourable to breeding resources and stimulating natural regeneration effectively when thinning density is 8.5%～30% and stand crown closure is 0.5～0.6 after forest tending.